Water-reactive asphalt cold patch, preparation method therefor and use method thereof

Abstract

Disclosed in the present invention are a water-reactive asphalt cold patch, a preparation method therefor and a use method thereof. The water-reactive asphalt cold patch of the present invention comprises the following components in parts by mass: 1000 parts of aggregates; 50-60 parts of mineral powder, 85-150 parts of emulsified asphalt, 15-30 parts of a demulsifier, and 1-10 parts of a super absorbent resin. The preparation method for the water-reactive asphalt cold patch of the present invention comprises the following steps: 1) adding aggregates to a mixing vessel and mixing uniformly; 2) adding emulsified asphalt to the mixing vessel and mixing uniformly; 3) adding mineral powder and a demulsifier to the mixing vessel and mixing uniformly; and 4) adding a super absorbent resin to the mixing vessel and mixing uniformly. The water-reactive asphalt cold patch of the present invention has the advantages of simple storage, convenient construction, rapid early strength development, good adhesion to the original pavement, strong resistance to water damage, and eco-friendliness, and is suitable for large-scale popularization and application.

Description

A water-reactive asphalt cold patch material and its preparation method and use method Technical Field

[0001] The present invention relates to the technical field of road maintenance, and in particular to a water-reactive asphalt cold patch material and a preparation method and a use method thereof. Background Art

[0002] Asphalt pavement refers to various types of pavement constructed by mixing road asphalt with mineral materials. Its advantages include comfortable driving, low tire-road friction noise, and high strength, leading to its widespread application. However, due to the combined effects of natural factors and vehicle loads, asphalt pavement is prone to potholes. The presence of potholes not only affects driving comfort but also safety. Currently, there are two methods for repairing potholes in asphalt pavements: hot patching and cold patching. The hot patching method has high requirements for the construction environment and equipment, and is not suitable for the rapid repair of small potholes. The cold patching method, on the other hand, pre-prepares asphalt cold patch material, seals it, and stores it dry. When needed, it is transported to the construction site, mixed with water, and spread. This method can quickly repair potholes and quickly restore traffic, and has better practical application prospects than the hot patching method. However, existing asphalt cold patch materials have problems such as difficult storage, high construction requirements, slow early strength development, poor adhesion to the original pavement, poor resistance to water damage, and susceptibility to secondary damage, making them difficult to fully meet practical application requirements.

[0003] Therefore, it is of great significance to develop an asphalt cold patch material that is simple to store, convenient to construct, develops fast early strength, has good bonding performance with the original pavement, and has strong resistance to water damage.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to provide a water-reactive asphalt cold patch material and a preparation method and a use method thereof.

[0006] The technical solution adopted by the present invention is:

[0007] A water-reactive asphalt cold patch material comprising the following components in parts by mass:

[0008] Aggregate: 1000 parts;

[0009] Mineral powder: 50 to 60 parts;

[0010] Emulsified asphalt: 85 to 150 parts;

[0011] Demulsifier: 15 to 30 parts;

[0012] Super absorbent resin: 1 to 10 parts.

[0013] Preferably, the aggregate comprises the following components in percentage by mass:

[0014] Aggregates with particle size of 10mm to 15mm: 19% to 28%;

[0015] Aggregates with particle size of 5mm to 10mm: 35% to 43%;

[0016] Aggregates with particle size of 3mm to 5mm: 11% to 18%;

[0017] Aggregates with a particle size less than 3mm: 16% to 26%. Aggregates of different particle sizes are graded according to specific proportions to ensure that the water-reactive asphalt cold patch material has a stable aggregate dense structure.

[0018] Preferably, the mineral powder is limestone mineral powder with a mesh size of 500 to 600.

[0019] Preferably, the emulsified asphalt has an elastic recovery of ≥93% at 25°C, a composite shear modulus of ≥10 kPa at 60°C, a dynamic viscosity of ≥38500 Pa·s at 60°C, and a rutting factor of the evaporation residue (G ＊ Emulsified asphalt with a pressure drop ( / sinδ) ≥ 2.5kPa, an elongation at 5°C ≥ 30cm, and an evaporation residue content ≥ 60.5%. Emulsified asphalt has excellent room-temperature fluidity. During the production of water-reactive asphalt cold patch mix, the asphalt does not need to be heated, reducing energy consumption and making the production method more environmentally friendly.

[0020] Preferably, the emulsified asphalt is cationic emulsified asphalt.

[0021] Preferably, the demulsifier is 190-210 mesh calcium oxide powder. The demulsifier can consume water in the emulsified asphalt system, thereby preventing the reaction between the super absorbent resin and water before the water-reactive asphalt cold patch material is put into use, thereby avoiding affecting the construction and workability of the water-reactive asphalt cold patch material.

[0022] Preferably, the super absorbent resin is a polyacrylate with a number-average molecular weight of 1000 to 8000. Super absorbent resin is a functional polymer material with a three-dimensional spatial network structure. There are a large number of strong water-absorbing groups such as carboxyl, hydroxyl, sulfonyl, and amide groups on the molecular chain. When it comes into contact with water, external free water molecules diffuse into the resin polymer network to form hydrated polymer chains, causing it to absorb hundreds or even thousands of times its own weight. The resin macromolecule chains are connected by hydrogen bonds to form a three-dimensional network structure that can effectively lock in water. The high concentration of ionic groups inside it creates an inward osmotic pressure inside and outside the system, thereby causing water in the environment to diffuse into the system and be locked. Based on the functional characteristics of super absorbent resin, its water absorption process includes chemical adsorption and physical adsorption. Chemical adsorption refers to the formation of a whole by chemical bonding between the hydrophilic groups on the super absorbent resin molecular chain and water molecules. When water-reactive asphalt cold patch material is used to repair potholes, the super absorbent resin and water undergo a curing reaction to form strength, thereby meeting road use requirements and achieving rapid traffic opening.

[0023] A method for preparing the water-reactive asphalt cold patch material as described above comprises the following steps:

[0024] 1) Add the aggregate into the mixing pot and stir evenly;

[0025] 2) Add emulsified asphalt into the mixing pot and stir evenly;

[0026] 3) Add mineral powder and demulsifier into the mixing pot and stir evenly;

[0027] 4) Add super absorbent resin into the mixing pot and stir evenly to obtain water-reactive asphalt cold patch material.

[0028] Preferably, the stirring time in step 1) is 20s to 40s.

[0029] Preferably, the stirring time in step 2) is 40s to 50s.

[0030] Preferably, the stirring time in step 3) is 20s to 35s.

[0031] Preferably, the stirring time in step 4) is 20s to 30s.

[0032] Preferably, the total stirring time in steps 1) to 4) is ≤ 180 s.

[0033] A method for using the water-reactive asphalt cold patch material as described above comprises the following steps: adding water to the water-reactive asphalt cold patch material, stirring for 10s to 25s, and then filling the potholes on the asphalt pavement.

[0034] Preferably, the mass ratio of the water-reactive asphalt cold patch material to water is 1:0.01 to 0.21.

[0035] The beneficial effects of the present invention are: the water-reactive asphalt cold patch material of the present invention has the advantages of simple storage, convenient construction, rapid early strength development, good adhesion to the original pavement, strong resistance to water damage, and green environmental protection, and is suitable for large-scale promotion and application.

[0036] Specifically:

[0037] 1) The water-reactive asphalt cold patch material of the present invention overcomes the technical difficulties of traditional asphalt cold patch materials, such as difficulty in storage, slow early strength formation, poor adhesion to the original pavement, easy secondary damage, difficulty in mixing multiple additives at the construction site, and high construction technical requirements. It has stable storage performance, fast early strength improvement, good adhesion to the original pavement, simple production process, good road performance, and is green and environmentally friendly, fully meeting the requirements of simple use and rapid traffic opening of asphalt cold patch materials.

[0038] 2) The water-reactive asphalt cold patch material of the present invention is in a loose state at room temperature and is easy to store. When used, it can quickly form early strength by adding water and undergoing a curing reaction with a highly absorbent resin, which is conducive to rapid traffic. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawing is a flow chart of the preparation method of the water-reactive asphalt cold patch material of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further explained and illustrated below with reference to specific embodiments. The process for preparing a water-reactive asphalt cold patch material according to the present invention is shown in the accompanying drawings. In block S100, aggregate is added to a mixing pot and stirred evenly; in block S200, emulsified asphalt is added to the mixing pot and stirred evenly; in block S300, mineral powder and a demulsifier are added to the mixing pot and stirred evenly; and in block S400, a super absorbent resin is added to the mixing pot and stirred evenly, thereby obtaining the water-reactive asphalt cold patch material.

[0041] Example 1:

[0042] A water-reactive asphalt cold patch material, the composition of which is shown in the following table:

[0043] Table 1 Composition of a water-reactive asphalt cold patch material

[0044] The preparation method of the water-reactive asphalt cold patch material is as follows:

[0045] 1) Add aggregate to the mixing pot and stir for 40 seconds;

[0046] 2) Add cationic emulsified asphalt into the mixing pot and stir for 45 seconds;

[0047] 3) Add limestone powder and calcium oxide powder to a mixing pot and stir for 35 seconds;

[0048] 4) Add polyacrylate into the mixing pot and stir for 25 seconds to obtain water-reactive asphalt cold patch material.

[0049] Example 2:

[0050] A water-reactive asphalt cold patch material, the composition of which is shown in the following table:

[0051] Table 2 Composition of a water-reactive asphalt cold patch material

[0052] The preparation method of the water-reactive asphalt cold patch material is as follows:

[0053] 1) Add aggregate to the mixing pot and stir for 40 seconds;

[0054] 2) Add cationic emulsified asphalt into the mixing pot and stir for 45 seconds;

[0055] 3) Add limestone powder and calcium oxide powder to a mixing pot and stir for 35 seconds;

[0056] 4) Add polyacrylate into the mixing pot and stir for 25 seconds to obtain water-reactive asphalt cold patch material.

[0057] Example 3:

[0058] A water-reactive asphalt cold patch material, the composition of which is shown in the following table:

[0059] Table 3 Composition of a water-reactive asphalt cold patch material

[0060] The preparation method of the water-reactive asphalt cold patch material is as follows:

[0061] 1) Add aggregate to the mixing pot and stir for 40 seconds;

[0062] 2) Add cationic emulsified asphalt into the mixing pot and stir for 45 seconds;

[0063] 3) Add limestone powder and calcium oxide powder to a mixing pot and stir for 35 seconds;

[0064] 4) Add polyacrylate into the mixing pot and stir for 25 seconds to obtain water-reactive asphalt cold patch material.

[0065] Example 4:

[0066] A water-reactive asphalt cold patch material, the composition of which is shown in the following table:

[0067] Table 4 Composition of a water-reactive asphalt cold patch material

[0068] The preparation method of the water-reactive asphalt cold patch material is as follows:

[0069] 1) Add aggregate to the mixing pot and stir for 40 seconds;

[0070] 2) Add cationic emulsified asphalt into the mixing pot and stir for 45 seconds;

[0071] 3) Add limestone powder and calcium oxide powder to a mixing pot and stir for 35 seconds;

[0072] 4) Add polyacrylate into the mixing pot and stir for 25 seconds to obtain water-reactive asphalt cold patch material.

[0073] Example 5:

[0074] A water-reactive asphalt cold patch material, the composition of which is shown in the following table:

[0075] Table 5 Composition of a water-reactive asphalt cold patch material

[0076] The preparation method of the water-reactive asphalt cold patch material is as follows:

[0077] 1) Add aggregate to the mixing pot and stir for 40 seconds;

[0078] 2) Add cationic emulsified asphalt into the mixing pot and stir for 45 seconds;

[0079] 3) Add limestone powder and calcium oxide powder to a mixing pot and stir for 35 seconds;

[0080] 4) Add polyacrylate into the mixing pot and stir for 25 seconds to obtain water-reactive asphalt cold patch material.

[0081] Example 6:

[0082] A water-reactive asphalt cold patch material, the composition of which is shown in the following table:

[0083] Table 6 Composition of a water-reactive asphalt cold patch material

[0084] The preparation method of the water-reactive asphalt cold patch material is as follows:

[0085] 1) Add aggregate to the mixing pot and stir for 40 seconds;

[0086] 2) Add cationic emulsified asphalt into the mixing pot and stir for 45 seconds;

[0087] 3) Add limestone powder and calcium oxide powder to a mixing pot and stir for 35 seconds;

[0088] 4) Add polyacrylate into the mixing pot and stir for 25 seconds to obtain water-reactive asphalt cold patch material.

[0089] Example 7:

[0090] A water-reactive asphalt cold patch material, the composition of which is shown in the following table:

[0091] Table 7 Composition of a water-reactive asphalt cold patch material

[0092] The preparation method of the water-reactive asphalt cold patch material is as follows:

[0093] 1) Add aggregate to the mixing pot and stir for 40 seconds;

[0094] 2) Add cationic emulsified asphalt into the mixing pot and stir for 45 seconds;

[0095] 3) Add limestone powder and calcium oxide powder to a mixing pot and stir for 35 seconds;

[0096] 4) Add polyacrylate into the mixing pot and stir for 25 seconds to obtain water-reactive asphalt cold patch material.

[0097] Comparative Example:

[0098] An asphalt cold patch material, the composition of which is shown in the following table:

[0099] Table 8 Composition of an asphalt cold patch material

[0100] The preparation method of the above-mentioned asphalt cold patch material is as follows:

[0101] 1) Add aggregate to the mixing pot and stir for 40 seconds;

[0102] 2) Add cationic emulsified asphalt into the mixing pot and stir for 45 seconds;

[0103] 3) Add limestone powder and calcium oxide powder into the mixing pot and stir for 35 seconds to obtain the asphalt cold patch material.

[0104] Performance testing:

[0105] The performance test results of the water-reactive asphalt cold patch materials of Examples 1 to 7 and the asphalt cold patch materials of the comparative example are shown in the following table:

[0106] Table 9 Performance test results of water-reactive asphalt cold patch materials of Examples 1 to 7 and the asphalt cold patch materials of the comparative example

[0107] Note:

[0108] The water-reactive asphalt cold patch materials of Examples 1 to 7 were added with water and stirred for 20 seconds (strength was formed by the reaction of polyacrylate with water) to prepare asphalt cold patch material test samples (the mass ratios of the water-reactive asphalt cold patch materials of Examples 1 to 7 to water were 1231:20, 1231:20, 1157:40, 1159:96, 1236:120, 1178:160 and 1190:240, respectively; the asphalt cold patch materials of the comparative example did not contain polyacrylate and did not require the addition of water), and then the adhesion grade, penetration strength, Marshall stability, residual stability, water peeling resistance, cohesion and splitting tensile strength tests were carried out.

[0109] Adhesion level: Tested with reference to "JT / T 972-2015 Asphalt Pavement Pothole Cold Patching Finished Materials".

[0110] Penetration strength: Tested with reference to "JT / T 972-2015 Asphalt Pavement Pothole Cold Patching Finished Materials".

[0111] Marshall stability: Tested with reference to "JT T972-2015 Asphalt Pavement Pothole Cold Patching Finished Materials", details are as follows:

[0112] a) Initial Marshall stability: The asphalt cold patch material test sample was compacted 50 times on both sides at room temperature to form a Marshall specimen. The specimen met the requirements of 63.5 mm ± 1.3 mm. The Marshall stability was measured directly after demoulding (without water bath) to simulate the outdoor repair process.

[0113] b) Forming Marshall stability: Place the asphalt cold patch material test sample into the Marshall test mold, compact it 25 times on both sides, and put it together with the test mold into an oven set at 110℃ for 24 hours. After taking it out, compact it 25 times on both sides again to make a Marshall specimen. The specimen must meet the requirements of 63.5mm±1.3mm. After demoulding, cure it in a constant temperature water tank at 25℃ for 60 minutes, and then conduct the Marshall stability test.

[0114] Residual stability: The test was conducted with reference to "JT T972-2015 Asphalt Pavement Pothole Cold Patch Finished Materials", specifically as follows: the asphalt cold patch material was made into two groups of test pieces, one group was placed in a 60°C constant temperature water tank for insulation for 30 minutes, and then taken out to test its Marshall stability MS1; the other group was placed in a 60°C constant temperature water tank for insulation for 48 hours, and then taken out to test its Marshall stability MS2, and then the residual stability MS0 was calculated. The calculation formula for the residual stability is: MS0 (%) = MS2 / MS1 × 100%.

[0115] Moisture content: Test in accordance with "JTJ F40-2004 Technical Specifications for Highway Asphalt Pavement Construction".

[0116] Water peeling resistance: Tested in accordance with "JTJ F40-2004 Technical Specifications for Highway Asphalt Pavement Construction".

[0117] Cohesion: Tested in accordance with "JTJ F40-2004 Technical Specifications for Highway Asphalt Pavement Construction".

[0118] Splitting tensile strength: Tested with reference to "JT / T 972-2015 Asphalt Pavement Pothole Cold Patching Finished Materials", details are as follows:

[0119] a) Initial splitting tensile strength: The same preparation method as the initial stability of the Marshall specimen was used for compaction, and the splitting tensile strength of the specimen was measured directly after demoulding (without water bath);

[0120] b) Molding splitting tensile strength: The asphalt cold patch material test sample is placed in a Marshall test mold, compacted 25 times on both sides, and placed together with the test mold in an oven set at 110℃ for 24 hours. After taking out, compacted 25 times on both sides again to make a Marshall specimen. The specimen meets the requirements of 63.5mm±1.3mm. After demolding, keep it in a constant temperature water bath at 15℃±0.5℃ for 1.5 hours. The molding splitting tensile strength is measured under the conditions of a loading rate of 50mm / min.

[0121] From Table 9 we can see that:

[0122] a) Compared with the asphalt cold patch material of the comparative example, the water-reactive asphalt cold patch materials of Examples 1 to 7 have various properties that are improved to varying degrees due to the incorporation of a certain amount of polyacrylate (super absorbent resin). This is because the polyacrylate undergoes a curing reaction with water, which enhances the bonding effect between different materials. Therefore, the water-reactive asphalt cold patch material containing super absorbent resin of the present invention has obvious performance advantages;

[0123] b) The initial Marshall stability of the water-reactive asphalt cold patch materials of Examples 1 to 7 is greater than 2 kN, which meets the requirement of rapid traffic opening after the asphalt cold patch material is repaired. In addition, as the content of polyacrylate increases, the initial Marshall stability of the water-reactive asphalt cold patch material first increases and then decreases;

[0124] c) The Marshall stability of the water-reactive asphalt cold patch materials of Examples 1 to 7 is all above 4.5 kN, meeting the strength requirements of the asphalt cold patch materials after molding, and as the content of polyacrylate increases, the Marshall stability of the water-reactive asphalt cold patch materials first increases and then decreases;

[0125] d) The initial splitting tensile strength of the water-reactive asphalt cold patch materials of Examples 1 to 7 is ≥0.3 MPa, which can withstand the traffic load after repair and meet the requirements of rapid traffic opening;

[0126] e) Compared with the initial splitting tensile strength, the asphalt cold patch material with the same dosage of polyacrylate has different degrees of improvement in its formed splitting strength, and all of them are greater than 0.4MPa, which can withstand the traffic load after repair;

[0127] f) The water-reactive asphalt cold patch material of Example 3 has the best performance (key indicators such as Marshall stability, splitting strength, and penetration strength are all high), and the amount of emulsified asphalt added is not much and the content of polyacrylate added is moderate, which is conducive to cost saving.

[0128] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A water-reactive asphalt cold patch material, characterized in that, Comprising the following components in parts by mass: Aggregate: 1000 parts; Mineral powder: 50 parts to 60 parts; Emulsified asphalt: 85 parts to 150 parts; Demulsifier: 15 parts to 30 parts; Superabsorbent resin: 1 part to 10 parts.

2. The water-reactive asphalt cold patch material according to claim 1, characterized in that, The aggregate comprises the following components in mass percentages: Aggregate with a particle size of 10 mm to 15 mm: 19% to 28%; Aggregate with a particle size of 5 mm to 10 mm: 35% to 43%; Aggregate with a particle size of 3 mm to 5 mm: 11% to 18%; Aggregate with a particle size less than 3 mm: 16% to 26%.

3. The water-reactive asphalt cold patch material according to claim 1, characterized in that, The mineral powder is limestone mineral powder with a mesh size of 500 to 600.

4. The water-reactive asphalt cold patch material according to any one of claims 1 to 3, characterized in that, The emulsified asphalt is an emulsified asphalt with an elastic recovery ≥ 93% at 25°C, a complex shear modulus ≥ 10 kPa at 60°C, a dynamic viscosity ≥ 38500 Pa·s at 60°C, a rutting factor of the evaporation residue ≥ 2.5 kPa, a ductility ≥ 30 cm at 5°C, and an evaporation residue content ≥ 60.5%.

5. The water-reactive asphalt cold patch material according to any one of claims 1 to 3, characterized in that The demulsifier is calcium oxide powder with a mesh size of 190 to 210.

6. The water-reactive asphalt cold patch material according to any one of claims 1 to 3, characterized in that The superabsorbent resin is polyacrylate with a number average molecular weight of 1000 to 8000.

7. A preparation method of the water-reactive asphalt cold patch material according to any one of claims 1 to 6, characterized in that, Comprising the following steps: 1) Add the aggregate to the mixing pan and mix evenly; 2) Add the emulsified asphalt to the mixing pan and mix evenly; 3) Add the mineral powder and the demulsifier to the mixing pan and mix evenly; 4) Add the superabsorbent resin to the mixing pan and mix evenly to obtain the water-reactive asphalt cold patch material.

8. The preparation method according to claim 7, wherein The mixing time in step 1) is 20 s to 40 s; the mixing time in step 2) is 40 s to 50 s; the mixing time in step 3) is 20 s to 35 s; the mixing time in step 4) is 20 s to 30 s; the total mixing time in steps 1) to 4) ≤ 180 s.

9. A method for using the water-reactive asphalt cold patch material according to any one of claims 1 to 6, characterized in that, Comprising the following steps: Add water to the water-reactive asphalt cold patch material, mix for another 10 s to 25 s, and then fill the potholes in the asphalt pavement.

10. The method of use according to claim 9, characterized in that, The mass ratio of the water-reactive asphalt cold patch material to water is 1:0.01 to 0.21.

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